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import cffi
ffi = cffi.FFI()
ffi.cdef("""int my_algo(int); extern "Python" int f(int);""")
ffi.set_source("_extern_python_cffi", """
static int f(int);
static int my_algo(int n) {
int i, sum = 0;
for (i = 0; i < n; i++)
sum += f(i);
return sum;
}
""")
ffi.compile()
from _extern_python_cffi import ffi, lib
@ffi.def_extern()
def f(n):
return n * n
assert lib.my_algo(10) == 0+1+4+9+16+25+36+49+64+81
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